Separation of certain carboxylic acids utilizing cation exchange membranes

Patent · Tue Oct 09 04:00:00 EDT 1984

OSTI ID:7246881

Chum, H L; Sopher, D W

A method is described for substantially separating monofunctional lower carboxylic acids from a liquid mixture containing the acids wherein the pH of the mixture is adjusted to a value in the range of from about 1 to about 5 to form protonated acids. The mixture is heated to an elevated temperature not greater than about 100 C and brought in contact with one side of a perfluorinated cation exchange membrane having sulfonate or carboxylate groups or mixtures thereof with the mixture containing the protonated acids. A pressure gradient can be established across the membrane with the mixture being under higher pressure, so that protonated monofunctional lower carboxylic acids pass through the membrane at a substantially faster rate than the remainder of the mixture thereby substantially separating the acids from the mixture. 2 figs.

• Assignee: Dept. of Energy, Washington, DC (United States)
• Patent Number(s): A; US 4476025
• Application Number: PPN: US 6-492925
• OSTI ID: 7246881
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
CARBOXYLIC ACIDS
HEATING
ION EXCHANGE MATERIALS
MATERIALS
MEMBRANE TRANSPORT
ORGANIC ACIDS
ORGANIC COMPOUNDS
PH VALUE
PRESSURE GRADIENTS
SEPARATION PROCESSES